Owners of The White Bear pub on Freeman Street have closed the premises as investigations into the source of four confirmed cases of Legionnaires' diseases continues.
Heath officials have stressed that the closure is voluntary and that the specific source of the disease has not been identified.
A spokesman for Public Health England said: "At the moment we do not know where the source is but all four cases were in the area of Freeman Street not long before they became ill.
"The White Bear is in the area where we are investigating but they have taken the voluntary decision to close, we haven't found a source yet.
"Investigations are continuing and we have not ruled out alternative sources."
